How do ionic bonds form? Transferring the electron forms an ionic bond. After transferring the electron‚ the two atoms become ion n will attract together because they have the opposite charges. Then an ionic bond is formed. How do covalent bonds form? A covalent bond is for sharing of electrons. I remember it like co-existing electrons to share (Eg H20). It is usually between two non-metals. Which compound‚ sugar or salt‚ is a better conductor of electricity? Explain your answer. Salt
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Classification of matter • All the objects and substances that we see in the world are made of matter. • This matter can be classified according to whether it is a mixture or a pure substance. • A mixture is a combination of two or more substances‚ where these substances are not bonded (or joined) to each other and no chemical reaction occurs between the substances. Examples of mixtures are air (a mixture of different gases) and cereal in milk. • The main characteristics
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break them apart. The weak force is behind the processes of radioactive decay‚ when an unstable nucleus splits into two or more pieces. One important process in particular it is responsible for is beta decay. This happens when a neutron emits an electron and transforms itself into a proton‚ changing the atom into another element. The weak force thus demonstrates itself primarily through changes in particle identity‚ rather than particle motions. While the strength of the weak force is
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1 Class XII: Chemistry Chapter 1: The Solid State Concept 1. Solid: Solid is a state of matter in which the constituting particles are arranged very closely. The constituent particles can be atoms‚ molecules or ions. Properties of solids: a. They have definite mass‚ volume and shape. b. Intermolecular distances are short and hence the intermolecular forces are strong. c. Their constituent particles have fixed positions and can only oscillate about their mean positions. d. They are incompressible
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SEMICONDUCTOR a solid substance that has a conductivity between that of an insulator and that of most metals‚ either due to the addition of an impurity or because of temperature effects. Devices made of semiconductors‚ notably silicon‚ are essential components of most electronic circuits. 1. A semiconductor is a material which has electrical conductivitybetween that of a conductor such as copper and that of an insulatorsuch as glass. semiconductor is a material whose electrical conductivity is
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are made up of one or more metal. They have regular 3D lattice of positively charged ions. Metallic substances are bond together by metallic bond which has strong electrostatic attraction between the positive ions and the delocalised electrons. These delocalised electrons carry current giving metallic substance the ability to conduct electricity in solid or liquid form. Metallic substances are insoluble in water. Because of strong metallic bond‚ metallic substances have high melting point. It requires
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The notion of the atom all stared about 450 BC when a Greek scholar starting think when can something break on more‚ when are the pieces at their smallest‚ this mans name was Leucippus. Leucippus also had pupil who also thought the same way as Leucippus‚ his name was Democritus. They developed there ideas and when Democritus died his theory summed up briefly was that everything in the world was made of tiny pieced that could not be broken up any more. That how the word atom was derived from the Greek
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Introduction: Some metals such as copper‚ silver and gold are very good conductors of electricity. This is because they all have only one electron on the outer shell. This means that they need only a tiny amount of energy in order to allow the electron to move. Non-metals‚ however‚ do not have free electrons‚ so even non-metals that only have one electron on their outer shell can still hold onto them tightly. Aim Of The Investigation: The aim of the investigation is to find out if there is a
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Lesson Plan: Electric Circuits (~130 minutes) Concepts 1. Electricity is the flow of electric charge (electrons). 2. Electric Charge is a property of subatomic particles. 3. Current is the movement of electric charge. 4. Voltage is the electric potential that exists to move a charge. 5. Power is the rate at which electric energy is flowing in a circuit. 6. Ohm’s Law: Power = Voltage x Current. 7. Resistance is a physical property that quantifies how well a charge
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protons as electrons‚ so it is neutral in charge. It is a single particle of a chemical event. When an atom gains or loses an electron it becomes an ion. Ions are charged‚ while atoms are uncharged. An ion has either a positive or negative charge because there are unequal numbers of electrons and protons. A positive ion is called a cation‚ while a negative ion is called an anion. 3. Define electronegativity and explain what it has to do with the behavior of outer-shell electrons.
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